1) Cheerfulness 2) Festive, playful fun 3) French word used in English 4) Happiness 5) High spirits 6) Merriment 7) Party atmosphere Found on https://www.crosswordclues.com/clue/gaiety
(from the article `Horniman, Annie`) In 1908 she began her own repertory theatre, the Gaiety, in Manchester. Good playsfrom Greek tragedy to works by Shaw, John Galsworthy, Arnold ... Found on http://www.britannica.com/eb/a-z/g/2